*The SAE J1349 standard measures net horsepower with the manufacturer’s production muffler and air cleaner in place. Net horsepower more closely correlates with the power the operator will experience when using a Honda engine powered product. The power rating of the engines indicated in this document measures the net power output at 3600 rpm (7000 rpm for model GXH50, GXV50, GX25 and GX35) and net torque at 2500 rpm, as tested on a production engine. Mass production engines may vary from this value. Actual power output for the engine installed in the final machine will vary depending on numerous factors, including the operation speed of the engine in application, environmental conditions, maintenance and other variables.

*The SAE J1349 standard measures net horsepower with the manufacturer’s production muffler and air cleaner in place. Net horsepower more closely correlates with the power the operator will experience when using a Honda engine powered product. The power rating of the engines indicated in this document measures the net power output at 3600 rpm (7000 rpm for model GXH50, GXV50, GX25 and GX35) and net torque at 2500 rpm, as tested on a production engine. Mass production engines may vary from this value. Actual power output for the engine installed in the final machine will vary depending on numerous factors, including the operation speed of the engine in application, environmental conditions, maintenance and other variables.

Auto Choke System

Available as an option on GCV and GSV models

Honda’s Auto Choke System is available for use on GCV160 and GCV190 engines
in fixed-throttle lawnmower applications. This user-friendly system is truly automatic,
eliminating levers and cables.

The engine starts easily whether cold or hot and is ready to use immediately.

Once the engine is up and running, the Auto Choke automatically returns to an optimal
operating position.

Automatic Mechanical Decompression System

All engines

Honda’s automatic mechanical decompression system is designed to give you
quicker, easier starts.

This system, which is connected to the camshaft, reduces compression by opening
the exhaust valve slightly when the engine is being started. This reduces
the amount of force needed to start the engine and improves starting performance.

The system disengages automatically after the engine starts to prevent any power
loss during normal operation.

Belt-driven OHC design

Mini 4-Stroke Series

In addition to the milder operating noise of 4-Stroke engines in general, the Mini
4-Stroke’s belt-driven OHC design further reduces unpleasant mechanical noise.
Its lighter piston and other moving parts help keep vibration to a comfortable
level.

Honda’s simple design has made the GC and GS Series lighter and more compact
than any engine in their class. Plus, simple construction has minimized the number
of parts, making the engine more reliable and easier to operate.

Electronic Governor

iGX Series

The electronic governor minimizes governor droop. This increases available
power.

For most normal engines, available power is decreased when the engine is approaching
wide open throttle.

The iGX’s advanced electronic governor eliminates this by electronically controlling
the throttle to achieve a higher effective power output.

Full 360° "any-side-up" operation

Mini 4-Stroke Series

The innovative design of Honda’s Mini 4-Stroke engines allows them to be used
and stored in any position for full 360° usability. Upright, sideways, even
upside down – the Mini 4-Strokes will still run great.

An exclusive Honda rotary-slinger lubrication system keeps oil in a completely misted
state and circulates it using pressure fluctuations generated by the movement of
the piston.

Built-in passages effectively return the circulated oil to the oil reservoir from
every part of the engine. An oil return port positioned in the center of the
reservoir prevents oil from accidentally flowing into the combustion chamber.

Approximately half the operating cost of comparable 2-stroke engines

Mini 4-Stroke Series

Efficient 4-Stroke technology not only offers superior fuel economy, it also requires
no mixing of oil in the engine’s fuel supply. This substantially reduces
both oil consumption and the emission of unburned oil in the exhaust.

The results include better all-around environmental performance and operating costs
that actually decrease the more the engine is used!

Hemispherical Combustion Chamber

V-twin Series

The power is transmitted through forged-steel connecting rods and a forged-steel
crankshaft, supported by a full-pressure lubrication system.

9.3:1 compression ratio generates tremendous power.

Excellent combustion efficiency.

Allows a radial configuration to create high volumetric efficiency.

Places the spark plug near the center of the chamber for optimal flame travel.

This means increased engine efficiency and more power to your application.

High Capacity Oil Pump

V-Twin Series

The lubrication system uses a high capacity pump with discrete chambers. This
facilitates consistent oil delivery.

The high output oil pump offers numerous benefits:

Twice the capacity of the previous model

Redesigned pump cover and sealing system ensure engine reliability

Full pressure lubrication to the flywheel, PTO, and connecting-rod bearings

The result?

Reduced friction

Extended engine life

Less mechanical engine noise

Integrated Cylinder and Head

V-twin Series

The idea of integrating the cylinder & head into one unit is radical. Radically
smart. It eliminates the head gasket, head bolts, and allows for more airflow and
better cooling.

Speaking of cooling, improved cooling means better combustion management. Cooling
is also improved by each of the lightweight aluminum pushrods being housed in a
separate tube to achieve enhanced airflow.

When you put it all together (with fewer parts) you get an engine with reduced emissions
and greater-than-ever durability.

Integrated ECU (electronic control unit) with a self-tuning regulator (STR) governor
system

iGX Series

The innovative ECU monitors and controls engine functions including Throttle, Choke,
Ignition Timing, and Oil Alert. On some models, it also offers programmable
governor and throttle modes for unprecedented flexibility. A diagnostic LED
helps with trouble shooting. Stepper motors precisely control throttle and
choke position.

This allows the engine to communicate with the machine it is powering.

Operation is automated

Control becomes surer, faster and easier.

Enables drive-by-wire remote control operation of the engine, regulating functions
such as starting, throttle, ignition timing and diagnostics.

Engine speed can be programmed and varied based on the equipment application's load
and speed requirement.

Easier for inexperienced users to operate

Easily maintained - Ideal for rental applications

Lifetime Timing Belt Design

GC series, GS series

Honda’s GC and GS engines use the world’s first small engine internal
timing belt, designed to last the lifetime of the engine.

Small engine timing belts are usually external and are subject to wear caused by
dirt. Honda’s internal timing belt runs in oil, eliminating the need
for conventional drive gears.

This design:

Improves lubrication,

Reduces the weight of the engine, and

Provides quieter operation.

Oil Alert

GX series, V-twin series, iGX series

Honda’s Oil Alert system helps to prevent engine seizure due to a low oil
condition.

The system consists of an oil level sensor inside the crankcase. When the
oil reaches a level that is too low for safe operation, the engine warns you or
stops automatically.